Flame ionization negative ions

Interference occurs when compounds co-elute with the analytes and are not detected directly by a specific detector. The effect is to create negative peaks or an erratic response for the analyte. This problem can be identified by using a non-specific detector such as an ion trap MS detector, an MS in the electron impact ionization mode, or a flame ionization GC detector. 

The products were analyzed with a Shimadzu organic acid analyzer (LC-IOAD type) and an Okura SSC-1 steam chromatograph with a flame ionization detector and a Porapak R column. The products were found both in the solution and within the coated film. The samples for these analyses were the distillate that was prepared by evaporating 20 cm of the catholyte until 2 cm under reduced pressure. The products adsorbed on the coated film were released into 25 cm of distilled water under ultrasonic irradiation for 5 min. The identification of lactic acid (product) was performed by liquid chromatograph / electrospray mass spectrometry (LC/MS) examining negative ions. The apparatus used was a Hitachi M-1200 LC/MS. 

In the 1980s Shuie, D sa, Limero, Gigi Bear, and Bernard White were the doctoral students at Wentworth. The latter two studied negative ions in flames. Master s student Hernandez examined the response of the ECD at short reaction times. Limero studied fluorobenzenes. D sa discovered a fourth temperature region in the ECD for chloro and bromoethylenes. Limero, D sa, and Shuie researched electron capture in the atmospheric pressure chemical ionization system and obtained data for anion complexes using such equipment. Batten became intimately involved with this work. Lee and R. Ranatunga, the doctoral students of Zlatkis, made additional contributions. 

Chemical identification infrared spectrum (Ferslew et al, 1986 Shreenivasan and Boese, 1970) UV spectrophotometry (Ferslew et al., 1986) gas chromatography, flame ionization (Zerba and Ruveda, 1972) isothermal gas chromatography (Jane and Wheals, 1972) ion mobility spectrophotometry in the negative-ion acquisition mode (Allinson and McLeod, 1997a,b Allinson et al., 1998) NMR spectra (Ferslew et al., 1986 Mesilaakso, 1996). 

Many derivatization reagents for GC analyses of aliphatic primary amines by flame ionization detection (FID), electron capture detection, flame thermionic detection, GC-MS with selected ion monitoring (GC-MS-SIM), and electron-capture-negative-ion chemical ionization (GC-NICI-MS) detection with a modified thermal energy analyzer have been reported. ... 

HA, heterocyclic amine AA, aromatic amine PA, polyamine Al, aliphatic amine N, nitrosamine MAM, Musk amino metabolities ABDACs, alkylbenzyldimethylammonium chlorides BCD, electron capture detection AED, atomic emission detection FID, flame ionization detection FPD, flame photometric detection GC-MS-SIM, GC-MS selected ion monitoring NPD, nitrogen phosphorus detection NlCl, negative-ion chemical ionization El, electron ionization CGC, capihary GC A, air H, water W, waste. 

AES, atomic emission spectrometry AP(C)I, atmospheric pressure (chemical) ionization CGC, capillary gas chromatography DAD, diode array detection ESI, electrospray ionization FI, fluorescence detection ICP, indcutively coupled plasma LIE, laser-induced fluorescence Nl, negative ion NMR, nuclear magnetic resonance PFPD, pulsed flame photometric detector SRM, selected reaction monitoring. 

Flame charging occurs when particles are formed in or pass through a flame. At the high temperature of the flame, direct ionization of gas molecules creates high concentrations of positive and negative ions and thermionic emissions of electrons... 

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